Which of the following Eras is described by these two facts:
1. Earth's atmosphere was likely a mix of methane, ammonia, and other gases which would be
toxic to most life on our planet today.
2. Life (bacteria) first appeared on Earth.

i it is d i hope it

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek